Geforce 7950GT Extreme Edition help please =(

[ijimmyxi]

ever since i switched from my 7300LE to 7950GT extreme edition my cs has been acting very strange... every few rounds i always get connection problem and the game freezes but i still can turn around so i always have to reconnect and its getting very annoying... plus my fps in cs dropped from 200-250 to 100-150 when i switched to 7950GT... please help =(
thanks in advance